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Battery Storage Savings Calculator
Estimate how much a commercial battery system could save your business through peak shaving, solar storage, and energy arbitrage.
This calculator provides indicative estimates. For a precise assessment based on your half-hourly consumption data, book a free site survey. Already have solar? See our Solar ROI Calculator too.
Your Details
Your Battery Storage Estimate
Recommended Battery Size
100 kWh
Estimated Battery Cost
£45,000
Savings Breakdown
Total Annual Savings
£5,475
Payback Period
6.2 yrs
15-Year Net Return
£37,125
Peak Demand Reduction
30%
Effective ROI
12.2%
Get Your Detailed Battery Report
Enter your email to receive a PDF summary, or book a free site survey for a half-hourly consumption analysis and precise recommendation.
Frequently Asked Questions
Commercial batteries save money through three main mechanisms: peak shaving (reducing demand charges by discharging during expensive peak periods), energy arbitrage (charging at cheap off-peak rates and discharging during peak rates), and solar self-consumption maximisation (storing excess solar generation for use in evenings). For businesses with solar panels, batteries typically increase self-consumption from 50-60% to 80-90%, significantly improving overall returns.
Battery sizing depends on your energy consumption profile, peak demand, existing solar capacity, and tariff structure. A general rule for peak shaving is to size the battery to cover 2-4 hours of peak demand. For solar storage, the battery should be sized to capture daily excess generation. This calculator provides an initial estimate, but our engineers will model your half-hourly consumption data to recommend the optimal size during a free site survey.
Modern commercial battery systems like GivEnergy and Tesla Powerwall are warranted for 10 years and designed to last 15-20 years. Most manufacturers guarantee at least 70-80% capacity retention after 10 years. With proper management, commercial batteries typically perform one full cycle per day, well within their rated 6,000-10,000 cycle lifetime.
Yes. Retrofitting battery storage to an existing solar installation is straightforward and is one of the most common configurations we install. The battery connects to your existing electrical infrastructure and can be programmed to prioritise storing excess solar generation. Our engineers will assess compatibility during a free site survey and recommend the best integration approach.
How peak shaving cuts your demand charges
If your business is on a half-hourly metered supply, part of your bill is set by your highest half-hour of demand, not just the units you use. Peak shaving uses the battery to cap that maximum: it charges when electricity is cheap and discharges automatically when your site demand spikes, so the grid never sees the peak.
Capping a 100kW site peak at 70kW with a correctly-sized battery routinely trims 20–40% from the total bill — which is why the calculator above asks about your peak demand, not just your consumption. Pair it with commercial solar and the battery charges from your own roof instead of the grid.
- Best candidates: manufacturing, cold storage, refrigeration-heavy retail, and any site with motor start-up spikes.
- Typical sizing: enough capacity to cover 2–4 hours of the gap between your peak and your target ceiling.
- Tax treatment: commercial battery systems can qualify for the Annual Investment Allowance.
Where we install
Local teams, local grid knowledge — start with your area:
- Commercial battery storage Northampton — peak shaving for logistics and manufacturing.
- Battery storage Colchester — backup power for North Essex businesses.
- Commercial solar Bishop's Stortford — M11-corridor warehouses and trade parks.
- Commercial solar Chelmsford — Essex county-town offices and industry.
Ready to Cut Your Business Energy Costs?
Get a free, no-obligation site survey and quotation for your commercial property. Our MCS certified team will assess your building and provide a detailed proposal within 5 working days.
Prefer to speak to someone?
01279 295630